Depressed, who s going to help me? Two

Diameter: 1,390,000 km.

Mass: kg.

Temperature: 5800 kat (surface) 15,600,000 kat (core).

The Sun is the largest object in the solar system. It has the entire mass of the solar system (Jupiter has most of the remaining mass).

The sun is personified in many myths: the ancient Greeks called it helios, while the ancient Romans called it sol.

The mass of the Sun is composed of 75% hydrogen and 25% helium (the atomic number is hydrogen, which is helium); Other substances ("Metals") is only the sum of the totals. In the core of the Sun, hydrogen is converted to helium, and these amounts change slowly.

The outer layers of the Sun have different rotation periods: the equatorial plane rotates once in the sky; In the polar regions, it reached 36 days. This peculiar phenomenon arises because the Sun is not a solid sphere like Earth, and a similar situation can be seen on gaseous planets.

Therefore, in the interior of the Sun, the rotation period is also different, but the core of the Sun still rotates like a solid body.

The state of the Sun's inner core is staggering, with a temperature of 15,600,000 Keliton and a pressure equivalent to 250 billion atmospheres. The gas in the inner core is so compressed that it is 150 times denser than water.

It is 10,000 times larger than the Earth, the central celestial body of the solar system. An ordinary star in the Milky Way. It is 100 million kilometers away from the earth, with a diameter of about 1,392,000 kilometers, and it takes more than 3,500 years to walk from the earth to the sun, even if you take an airplane, it will take more than 20 years.

The average density is gram cubic centimeter, the mass gram, the surface temperature is 5770, and the core temperature is 10,000. From the inside to the outside, they are the solar nuclear reaction zone, the solar troposphere, and the solar atmosphere. Thermonuclear reactions are constantly taking place in its central region, and the energy produced is radiated into space.

One in 2.2 billion of the energy radiates to the earth, becoming the main source of light and heat on the earth. Stars also have their own life histories, from birth, growth, aging, and eventually death. They come in different sizes, colors, and evolutionary journeys.

The star's connection to life is not only manifested in the fact that it provides light and heat. In fact, the heavy atoms that make up planets and living matter were created during the explosions that occurred at the end of the lives of some stars. The sun is an ordinary star.

If there are x number of female students, the number of male students is (5x) 6

From the meaning of the question: (5x) 6=(x+(5x) 6+3)*5 12, x=18

The number of boys is (5x) 6=15 (person).

The number of girls is now x+3=21 (person).

3. 1, Na2O+CO2=Na2CO3

caco3(△)cao + co2

zn+h2so4=h2↑+znso4

BaCl2+Na2SO4=BaSO4+2NaCl2, oxidation reaction: 5Na2SO3+2KMno4+8H2SO4=5Na2SO4+K2SO4+2MnSO4+8H2O

Reduction reaction: MnO2+4HCl (concentrated)=MnCl2+2H2O+Cl2 In the above reaction, KMno4 is the oxidizing agent; Na2SO3 is a reducing agent.

3、naoh+hcl=nacl+h2o

Chemical reaction: A chemical reaction is a reaction in which two or more substances react to form a new substance. Example: 2H2 + O2 == Ignite == 2H2O

Decomposition reaction: The reaction in which two or more other substances are generated from one substance is called a decomposition reaction. Example: caco = = high temperature) cao + co

Displacement reaction: The displacement reaction is a chemical reaction in which an element reacts with a compound to form another element and compound, e.g., Zn+2HCl= ZnCl+H

Metathesis reaction: The metathesis reaction is a reaction in which two compounds exchange components with each other to produce two other compounds, for example: H2SO4 + BACL2 = 2HCl + BaSO4

Neutralization reaction: A reaction in which acids and bases exchange components with each other to form salts and water. Beg!

If there are x rooms in total, then someone is 2x+12

3x-2=2x+12

x=14A: There are 14 room code lines and 3*14-2=40 people.

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